Smiths Lake estuary is located on the mid-north coast of New South Wales. It is classed as a lake with an entrance that intermittently opens to the sea.
Occasionally the lake is artificially opened by council to prevent flooding of low-lying areas. The entrance is predominantly closed, so most of the time the water level depends on the amount of runoff and evaporation that occurs.
Smiths Lake is a popular tourist destination, especially in summer. Most development is concentrated around the township on the north side of the lake, with the vast majority of the shoreline undeveloped.